import requests

# a = "s_" + "1"
#
# eval(a)

session_x = 'session_' + "2"
try:
    eval(session_x)  # 对拼接的session求值，判断是否是第一次, test3 已测试
except:
    exec("%s = requests.session()" % session_x)


print(session_x)